E2Guardian - Web filtering solution
pfSense - pfSense is a free and open source firewall and router that also features unified threat management, load balancing, multi WAN, and more
NxFilter - Best performance. You don't want to slow down your network by installing a network security software. NxFilter is a light-weight DNS filter. It doesn't cause any latency issue in your network.
CacheGuard-OS - CacheGuard is an enterprise grade Web Gateway solution offering Web Security & Optimization in the same box. Price starting at $99 per Year!
Qustodio - Free parental control software. Monitor and track your child's online activity. Block dangerous sites and protect kids from online bullying.
Diladele Web Safety - Diladele Web Safety is the name of a simple, easy to use and powerful web filter for all kind of activities over the internet.